Form for concrete silo construction.



B. BIGGS.

FORM ron CONCRETE SILO cowsmucnom.

APPLICATIOII FILED JAN. 6 I919. 1,301,364. Patented Apr. 22,

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jiENtI'AMIliT Jameson SEATTLE, WASHINGTON.

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To all whom it may concern:

Be it known "that I, BENJAMIN BIGGS, a citizen of I the United States, and resident of the city of Seattle, county of King, and State of :Washington, have invented certain new and useful-Improvements in Forms for Concrete Silo Construction, of

which the following isa' specification.

My inventionrelates to forms designed for use in molding circular concrete walls, such for instance as' concrete silos.

The object of my invention is to provide sectional forms which may be conveniently used for this purpose and which may be adjusted'so asto be used in making silos of considerable size in its diameter.

My invention consists of certainpeculiar constructionsand combinations of parts, which will be hereindescribed and then defined by the claims. y l The accompanying drawings show the manner of constructing myforins."

Figure 1 shows, in horizontal section,one

of the segments usedfor forming'the outer surface ofthe silos.

Fig. 2 shows,-in horizontal section, one of the segments used'informing the inner surface of'the'silos.

segments,showing a portion'of'one of the ribs broken awa m Fig. 4 shows, inhoriz ontal section, a section designed for forming the outer sur- Y ,crete'1spoured5 One oftheob ects of 'ap'r sena invention-" y mg edges of adjacentsegments would be "securedtofleach other.- The bolts 4i pass vary considerably diameter. To this end I construct a form'fwhich is in segments 1 and add to or remove i segments,"a s may be to"get* the proper'circumferem tial dimension sired, and at thesame time provide means ereby h mo d g sur a w h is n to the concrete, maybe adjusted "in curlvar.

the size of silo being made.

In Fig. 4 is shown, in cross section, the vertical staves 1 and the sheet metal plate 2, which forms the molding surface or that which is in contact with the concrete when I ,Specification of Letters Patent.

ira mentar'y view showing the face of one" f s themolflihg surface" con- V of flexibility, ture to correspond with the curvature'of Patented Apr. 22, 1919.

l 3 "Application filed January 6, 1919. Serial No. 269,780.

poured. These staves 1 may be of such vertical length as desired. I prefer to make these of comparativelyshort length and to employ the molds by pouring a certain vertical section of the wall and then raising the molds for pouring the next vertical sec tion.

The sheet metal plate 2 should be secured to these staves so as to permit free bending with the limits which would be employed for any particular segment. I have shown these as being provided with slots 20, through which pass the shanks of screws 21, the latter screwing into the staves 1, which staves are made of wood. lhis permits a certain amount of slipping of the sheet metal over the surface of the staves, which are toward the ends of the segment.

I also employ two or more stifiening bars 3 which are secured to the opposite sides of the staves 1. These bars are made of flat bar iron, of such a size as to provide a certam measure of stiffness and yet not so heavy but that they maybe bent within relatively smalllimits. y I

These bars are shown as secured to the staves'by-me'ans of screws 30, which pass through holes in the bars. These bars are Fig. 3 isan-inside face view of one of the staves; and to recess these stavesto accommodate the heads of the bolts. I also providea nut 40, or other} means, whereby the bolt may be fixedlysecured to the bar 3.

Along with the above parts I provide two i stiffening ribs means would be provided whereby the meetthrough,- or are otherwise secured to the 5 flfor each segment. These ribsiwould preferably be made ofwood and jribs '5." These bolts are secured in proper Lposition with relation to the ribs by the use of additional nuts, 41" and 42, which engage opposite edgedsurfaces of the ribs.

The portion of the segments "represented 9.

bythe staves 1,the sheet metal plate 2, and the iron bars 3 possesses a sufficient amount varied and thus be made to fit the curved outline of silos of difierent diameters. The manner of securing this part of the segment to the ribs 5 provides a convenient means for securing this variation in curvature.

sothat its curvature maybe Referring to Fig. 2, which shows a segment designed for shaping a portion of the inner surface of the wall, the curved edge of the rib 5 being the edge which is next to the staves 1, is made of a curvature which would be substantially that of the smallest size of silo which it might be desired to mold by the use of this device.

In molding such a silo, the bar 3 Would be bent so as to fit closely against the edge surface of the rib throughout its length. If, however, it be desired to use the moldto form a silo of larger diametenthe end portions of the sections of staves which form this segment, would be disposed and held outwardly enough to conform to the curvature of the desired silo. This may easily be done by adjusting the bolts 4 through the means of the two nuts 41 and 42. I alsocontemplate the employment .of wedges, or spacing blocks, 6, which would be in.-

serted between the metal bar 3 and the edge of the rib 5.

The mold segments which would be used for forming the outer surface of the wall would be constructed alongsimilar lines. In this case the sheet metal plate 2 would be bent into .concaveshape, andthe .ourvediedge of the rib 50 would also be concaved. In forming these outer segments, the curvature of the'edge of the rib would be made substantially that whiclrcon-forms to thecurvature of the silo of a larger diameter, which it might be desired to make, and theamold would be adjusted for making silos of,-

smaller diameter by forcing outward the side edges oftheseriesof staves which compose this segment.

I have foundthatj by .this-schemeI. can ;use thesame mold-for constructingsilos varying in. size throughoutv substantially the entire.

limit of diameters ordinarily used Of course, where a large silo is being made,ad ditional segments wilL-have to be inserted over what would be required for ,a smaller sized-silo. ,It may be desirable :to haveone ormore segmentslof a lesser widththan-the.

ma Ority, in order to more accurately get the correct curvature, and 1n order tomold a silo of the exact size desired This, however, may be easilydone and any e mechanic "would know howto do this. 7

I prefer to carry the surfacingv sheet 2 somewhat beyond theredges of thestaves, as is shown at 22, and-to overlap thls edgelof one segment over the corresponding edge of ;;staves and a surfacing a I and? s d r b yeud th -st w -;t 'o

the a iaqent egment, t making a tinuous "molding-surface.

What I claim my invention is:

l. A form for'mo'lding silos and like cir cular concrete walls, comprising a series of vertical segments adapted to be assembled to form-the circular ,outline, said segments having transversely extending ribs and longitudinally extending lstaves, bars connect ing the stavesiof each, section andadapted to bend to conform to theburvature ref walls d br n di me ers, and means for adjust ably securing said bars ztothez ribs.

2. A form -for m0ldingSllQSr yand li-kecirribs, extending about the form, vertical '80 v u ae 'ng sh ets secur d t aid ar syb lt se ringsai tav sto t b at in ervals, a dspaeingmembers a apted to be inserted to variably-,spaee the staves way mnh h ibsvtohere y Ma y th :a 8

dlus of cunvature -.;of the -;wal ;l ;moldingsurace a 4- .A o for m di gsilp and k c r-V cula-r concrete walls compr singsegmental ribs .iextending about [the form,- Nertieal staves, surfacing sheets secured to said staves,

segment bands extending across and securing together thestaves foreachrsegment-rib, a ase z ng" a d lmudswtoe r bs a and permitting variable adjustmentjof the595 r u o c rvature nfthewall. molding $1 face-F 5. A form for'molding circular cbnerete;e'

swells mprisi sa er es e fseginents a apts d .w enas emhle rto jex en iabqu the ir le,

h egmeethav ngk i ontal:1: $5;

plate SQQWE r pnn theadi sen eem nt ,v.eans ep -i aerate r m-th. r bs fo -wnne tihgw he s ate 1 loft-eachsegmen ,"and-'me nefe supporting t s r -fr n titer,ib 5per tti11a t ea iadjustment toward and ;from, th e-ribs to secure variationin the radius f, cunvature, v

Si ne e ,S t e sh t n,i his 30th 1 day of December, 4918. r

a v I BENJAMIN ,B Ges I Copies of this ipatent may ;be obtained for fivelcents,each,by adglressingthe ,Qomn iss ioner,oflfiatents,"

f Washing-ton, 13.10. V i I supporting them at 75 

